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Share-Based Compensation Share-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 20, 2019
Jun. 10, 2019
Mar. 29, 2019
Feb. 20, 2019
Jun. 25, 2018
Mar. 30, 2018
Aug. 03, 2019
Aug. 04, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation cost related to nonvested stock options             $ 10.4  
Weighted average period for recognition of unrecognized compensation cost (in years/months/days)             1 year 9 months 18 days  
Weighted average fair values of stock options granted during the period (in dollars per share)             $ 5.41 $ 5.89
Stock options granted (in shares)   1,077,700 5,100     431,371    
Stock awards/units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation cost related to nonvested stock awards/units             $ 23.8  
Equity instruments granted (in shares)     280,700     490,528    
Performance-based units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity instruments granted (in shares)             455,339  
Performance-based or market-based units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity instruments granted (in shares) 205,339       619,578      
Nonvested performance shares | Minimum | Vesting, Tranches After Initial Vesting Period                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period             2 years  
Nonvested performance shares | Maximum | Vesting, Tranches After Initial Vesting Period                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period             3 years  
Target performance units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period             3 years  
Target performance units | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Target vesting percentage             0.00%  
Target performance units | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Target vesting percentage             200.00%  
Market-based units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity instruments granted (in shares)             17,557  
Award vesting period             3 years  
Market-based units | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Target vesting percentage             0.00%  
Market-based units | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Target vesting percentage             150.00%  
Chief Executive Officer                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock options granted (in shares)       600,000        
Chief Executive Officer | Performance-based units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity instruments granted (in shares)       250,000        
Chief Executive Officer | Restricted stock units subject to clawback contingency                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity instruments granted (in shares)       150,000